Saw-guard.



F. V. PHILLIPS.

I SAW GUARD.

- Arrmouronrrun 'nA12 .21, 19 1s.

Patented Sept. 30, 1913.

FRANCIS VOSBURGI-I PHILLIPS, OF ORLANDO, FLORIDA.

-GUAED.

Specification of Letters Patent.

Patented Sept. so, rare.

Application filed March 21, 1913. Serial No. 755,997.

'This invention relates to guards'tor circular saws, the object vbeingto provide a guard which will effectively hold the work against backwardmovement and thus prevent injury to the operator or damage to the work.I

It has heretofore been proposed to provide a guard with a roll-er whichwould cp-' crate by the back pressure on the workto wedge itseltbetweenthe'work and an inclined track or guide-way, and thus hold I the workfirmly against the saw table. In

such prior devices it is necessary to make the angle of the inclinedguide-way comparatively small to secure a firm wedging action, but thereis always the liability of the roller being advanced by the work awayfrom the inclined track so that there is always a tendency to slippageof the work before wedging action takes place; To overcome thisobjection, I have provided a roller having teeth which mesh with aninclined rack; means being provided. for keeping the roller in mesh withtherack. The teeth opmovement within a comparatively sma l forerate withabiting action on the work and their engagement with the rack preventsslippage. I am also enabled to employ a somewhat greater angle of upwardmovement of theroller, and this adds to prompt ness of action and allowsa greater u )ward ward travel.

In the accompanying drawings I have illustrated one form of guardembodyingmy invention, and after a detail description thereof, the"features deemed novel will be specified in the appended claims.

Referring to the drawings, Figure 1 is a side elevation of a circularsaw with my improved guard in operative position thereon. Fig. 2 is anend elevation of Fig. 1,

and Fig. 3 is a longitudinal section of the guard removed from the saw.

A indicates the c rcular saw, B thework table, and G the work guide. Theguard D is in the form of a hood which is adjustably suspended over thesaw from a suitable support. The particular form of the hood isimmaterial, and the support may be in any form suitable for the machineto which it is applied. As shown, the guard D consists of an open workside plate at in the form of a segment of a circle and provided at itscurved edge with a flange (5 preterably conforming to the curvature ofthe saw. This guard is adjust-ably suspended over the saw with thestraight edge of the side plate (Z parallel with the worktable andsufliciently above the same to permit the passage of the work beneathsaid guard.

The guard is provided at one end with an integral hood or housing E inwhich the toothed roller F is mounted, said roller being provided withtrunnions f which proect through inclined slots 6 formed in the sidewalls eot said" housing. An inclined rack G is provided on the innersurface of the upper wall ofthe housing, said rack being parallel withthe inclined slots e in the side Wallsot the housing. The lower inclinedwalls of the slots 6 operate to at all times keep the teeth of theroller in mesh with the teeth of the rack. The roller is arranged theguard and in a direct line with the saw and slightly below the uppersurface of the work to be operated on. When the work is advanced to the.saw the roller will be raised by and rest upon the upper surfacethereof. It will now be seen that any backward movement of the work willbe instantly arrested by the wedging of the roller F between the socketformed on the upper wall of the roller housing E. This rod is adjustablysuspended from a bracket 1. secured to the work table B, or to any othersuitable sup- ,port. Said bracket is provided with a horizontal tubulararm 1', in which is slidably mounted a rod 2' carrying a hub or collar iin which therod H is sl idably mounted. The rod 2' is horizontallyzldjustable in the tubular arm 2' of the bracket, andis secured inadjusted position by a set screw i The to normally hang below the lowersurface of As shown, said rod H is provided with a threaded lowerendwhich IS in engagement with a threaded rod H is vertically adjustablein the collar 11 and is secured in adjusted position by set screw 11.The hood portion of the guard is braced by a link is secured at one endto a lug is on the guard D,and at theopposite end to the upper end ofthe rod H. With this form of mounting, all of the strainis in vertical.direction in line with the rod H, so that there can be no twisting orlateral motion due to resiliency of the guard or its mounting, as is thecase when the support is applied at a point removed from the Wedgingroller.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In a saw guard, the combination with aroller adapted to be engaged by the work to be operated on an inclinedrack arranged to wedge the roller between said rack and said work onbackward movement of said work, teeth carried by said roller, and meansfor keeping said teeth .in mesh with said rack.

work to be operated on, an inclined rack arranged to wedge vthe rollerbetween said rack and said work when the latter is moved rearwardly, andmeans for keeping said roller 1n mesh with sa d rack.

8. The combination with a guard adapted.

to house the upper portion of a circular saw, of a roller carried bysaid guard in line with said saw, an inclined track on said guardadapted to wedge said roller between said track and the work to beoperated on when the latter is moved in a'rearward direction, and asupportfor said guard arranged substantially in line with the upwardpressure exerted by said roller in its wedging action.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

FRANCIS VOSBURGH PHILLIPS.

